improve pkgconfig module (close json-parser#37)

Signed-off-by: Igor Gnatenko <i.gnatenko.brain@gmail.com>

Author: igor-raits

Makefile.in

@@ -4,6 +4,7 @@ prefix = @prefix@
 
 includedir = $(DESTDIR)@includedir@
 libdir = $(DESTDIR)@libdir@
+datadir = $(DESTDIR)@datadir@
 
 AR = @AR@
 CC = @CC@
@@ -40,6 +41,9 @@ clean:
 	rm -f libjsonparser.$(SO_EXT) libjsonparser.a json.o
 
 install-shared: libjsonparser.$(SO_EXT)
+	@echo Installing pkgconfig module: $(datadir)/pkgconfig/json-parser.pc
+	@install -d $(datadir)/pkgconfig/ || true
+	@install -m 0644 json-parser.pc $(datadir)/pkgconfig/json-parser.pc
 	@echo Installing shared library: $(libdir)/libjsonparser.$(SO_EXT)
 	@install -d $(libdir) || true
 	@install -m 0755 libjsonparser.$(SO_EXT) $(libdir)/$(REAL_NAME)

configure.ac

@@ -22,7 +22,9 @@ fi
 
 AC_SUBST(VERSION_MAJOR, $VERSION_MAJOR)
 
-AC_CONFIG_FILES([Makefile])
+AC_CONFIG_FILES([
+                 Makefile
+                 json-parser.pc])
 
 AC_OUTPUT
 

json-parser.pc.in

@@ -0,0 +1,10 @@
+prefix=@prefix@
+exec_prefix=@exec_prefix@
+libdir=@libdir@
+includedir=@includedir@
+
+Name: json-parser
+Description: Very low footprint JSON parser written in portable ANSI C
+Version: @VERSION_MAJOR@
+Libs: -L${libdir} -ljsonparser
+Cflags: -I${includedir}/json-parser